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This reverts commit 5072afda.

Reason for revert: Breaks long press animation

Original change's description:
> Remove AssistantState::VISIBLE
> 
> Remove the VISIBLE state and use AssistantVisibility instead.
> Also remove obsolete handling for AGSA animations.
> 
> Bug: b/140823590
> Test: Run existing tests
> Change-Id: Id64c5e536dfe6d3e10c9b003c135e76c96a9fee1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1802819
> Commit-Queue: Yue Li <updowndota@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Tao Wu <wutao@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#696936}

TBR=xiyuan@chromium.org,sammc@chromium.org,xiaohuic@chromium.org,updowndota@chromium.org,wutao@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/140823590
Change-Id: I4e5114bc64f459b0854433405027df3490d4b8a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829492Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700905}